The Official Blog of ESL Power Systems, Inc.

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To customers, distributors, and retailers, a certification mark means that they are purchasing a product that has been evaluated by an accredited independent organization. This third-party certification for electrical and power products means that a qualified independent testing laboratory has reviewed the manufacturing process of the particular product and has concluded that the final product…

HEP Configurations for Passenger Trains In the late 1990s, the American Public Transportation Association (APTA), implemented practices for Head End Power sources throughout the passenger rail industry. According to 3.1.3 in APTA RP-R-015-99, Head End Power (HEP) is defined as “A system by which 480 VAC 3-phase electrical power, to operate auxiliaries, is provided to…